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Medical Claims Liability - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Amounts recorded as an adjustment to premium revenues related to minimum HBR and return of premium programs	$ 21,000,000	$ 34,000,000
Short-duration insurance contracts, Incurred but not reported and expected development on reported claims	13,510,000,000
Premium deficiency reserve		178,000,000
Medicare
Segment Reporting Information [Line Items]
Premium deficiency reserve		178,000,000
Medicare | Medicare Advantage 2025
Segment Reporting Information [Line Items]
Premium deficiency reserve		$ 270,000,000	$ 92,000,000
Medicare | Medicare Advantage 2026
Segment Reporting Information [Line Items]
Premium deficiency reserve	$ 0

X

- Definition

Amounts Recorded As An Adjustment To Premium Revenues Related To Minimum HBR and Return Of Premium Programs

+ References

No definition available.

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- Definition

Premium Deficiency Reserve Liability

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 9E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480081/944-40-50-4E

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-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 4D
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480081/944-40-50-4D

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